package com.xxx.springboot.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * MD5加密工具类
 */
public class MD5Util {

	private static final Logger logger = LoggerFactory.getLogger(MD5Util.class);
	
	private static final String MD5_SALT_DEFAULT = "test@13579";
	 
	private MD5Util() {
	}
	
    /**
     * 32位加密（带默认盐）
     * 
     * @param s
     * @return
     */
    public static final String MD5_32(String s) {
    	s = s + MD5_SALT_DEFAULT;
    	String result = null;
        char[] hexDigits = {
                '0', '1', '2',  '3',  '4',  '5',  '6',  '7',  '8',  '9',
                'a',  'b',  'c', 'd',  'e', 'f'
        };
        try {
            byte[] btInput = s.getBytes();
            // 获得MD5摘要算法的 MessageDigest 对象
            MessageDigest mdInst = MessageDigest.getInstance("MD5");
            // 使用指定的字节更新摘要
            mdInst.update(btInput);
            // 获得密文
            byte[] md = mdInst.digest();
            // 把密文转换成十六进制的字符串形式
            int j = md.length;
            char[] str = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            result = new String(str);
        } catch (Exception e) {
        	logger.error(e.getMessage(), e);
        }
        return result;
    }

    /**
     * 16位加密（带默认盐）
     * 
     * @param s
     * @return
     */
    public static final String MD5_16(String s) {
    	s = s + MD5_SALT_DEFAULT;
        String result = null;
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(s.getBytes());
            byte[] b = md.digest();
            int i;
            StringBuilder buf = new StringBuilder("");
            for (int offset = 0; offset < b.length; offset++) {
                i = b[offset];
                if (i < 0)
                    i += 256;
                if (i < 16)
                    buf.append("0");
                buf.append(Integer.toHexString(i));
            }
            result = buf.toString().substring(8, 24);
        } catch (NoSuchAlgorithmException e) {
        	logger.error(e.getMessage(), e);
        }
        return result;
    }
    

    /**
     * 32位加密（带盐）
     * 
     * @param s
     * @return
     */
    public static final String MD5_32_WTIH_SALT(String s, String salt) {
    	s = s + salt;
    	String result = null;
        char[] hexDigits = {
                '0', '1', '2',  '3',  '4',  '5',  '6',  '7',  '8',  '9',
                'a',  'b',  'c', 'd',  'e', 'f'
        };
        try {
            byte[] btInput = s.getBytes();
            // 获得MD5摘要算法的 MessageDigest 对象
            MessageDigest mdInst = MessageDigest.getInstance("MD5");
            // 使用指定的字节更新摘要
            mdInst.update(btInput);
            // 获得密文
            byte[] md = mdInst.digest();
            // 把密文转换成十六进制的字符串形式
            int j = md.length;
            char[] str = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            result = new String(str);
        } catch (Exception e) {
        	logger.error(e.getMessage(), e);
        }
        return result;
    }

    /**
     * 16位加密（带盐）
     * 
     * @param s
     * @return
     */
    public static final String MD5_16_WTIH_SALT(String s, String salt) {
    	s = s + salt;
        String result = null;
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(s.getBytes());
            byte[] b = md.digest();
            int i;
            StringBuilder buf = new StringBuilder("");
            for (int offset = 0; offset < b.length; offset++) {
                i = b[offset];
                if (i < 0)
                    i += 256;
                if (i < 16)
                    buf.append("0");
                buf.append(Integer.toHexString(i));
            }
            result = buf.toString().substring(8, 24);
        } catch (NoSuchAlgorithmException e) {
        	logger.error(e.getMessage(), e);
        }
        return result;
    }

    public static void main(String[] args) {
//    	sign: 9f899a2a09805883757f2544e9b4d159
//    	pwd = "c1234567890";
    	String userName = "carlos";
        String inviteCode = "I7GMFE";
        String timestamp = "1567406348044";
        String fingerprint = "MSX0AUY2ITXEHUA7UJH75W8GV";
        String nonce = "f55342db-1ee4-4768-bf89-415b5f517748";
        String pwdRsa = "c1cd5b9405460ec3c29b5c472edbf6f69b0da61a49f4d44f7babbe250da7a2ba6e0a85c3632e44d327b6d6174934c4f6a6b0fef2c1a8bb5f5f97e90f376be926cd74cb6e9b3fd15f4837d4455035840b6552ebbb19a0a2bdf6b867f3cf7371b90a470742f841e1d0a7ba0595fbbbb145460b542bafac2e0bf166fc829641b934";
        System.out.println(MD5Util.MD5_32_WTIH_SALT(timestamp+fingerprint+nonce+userName+pwdRsa+inviteCode, MD5_SALT_DEFAULT));
    }
}
